Monthly Archives: October 2017

Almost Extreme 175 Tags Five Advanced Bases


This post reaches the halfway point in the review of Manuel Castillo’s Only Extreme collection, with Only Extreme 175. A double UR, a regular Sue de Coq and irregular XYZ-wing prepare the bv field for coloring, and an XY chain … Continue reading

Posted in Advanced Solving, Puzzle Reviews | Tagged , , , , , , | Leave a comment

Only Extreme 132 Is Cut From the Extreme Team


Another example of expansion of a limited coloring network via the not-both test on an AIC slink. It’s an extreme tactic that need only be tried as a last resort. While the expansion does work in OnEx 132, it is … Continue reading

Posted in Extreme Solving, Puzzle Reviews | Tagged , , , , , , , | Leave a comment

Only Extreme 89 Guilty on Two Counts


The Only Advanced 46 is followed by a truly Extreme 89. Two different unique Sysudoku trials lead to the same result. The Single Alternate Sue de Coq is deferred, but after advanced techniques fail, it is used.  An equally extreme … Continue reading

Posted in Extreme Solving, Puzzle Reviews | Tagged , , , , , , , | Leave a comment

Only Not Extreme 46


The review of Castillo’s Only Extreme collection continues with Only Extreme 46.  A very extensive bypass is survived, to leave very little to add in box marking, and an interesting line marking.  The rest is murder by the usual suspects … Continue reading

Posted in Advanced Solving, Puzzle Reviews | Tagged , , , , , , | Leave a comment

Fick’s Advanced Path on Only Extreme 3


In the pre-review post of August 29, Cluster Extension by Not-Both Trials, a series of coloring cluster expansions were made by testing the not-both condition for AIC slink coloring. Like other trials, this tactic is considered extreme here in Sysudoku. … Continue reading

Posted in Advanced Solving, Puzzle Reviews | Tagged , , , | Leave a comment